<template>
    <div>
        <h1>当前求和为:{{ sum }}</h1>
        <!--让其收集到的数据全是number类型的 number修饰符-->
        <select v-model.number="n">
            <!--让所有的value全部绑定为数字-->
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select>
        <button @click="increment">+</button>
        <button @click="decrement">-</button>
        <button @click="incrementOdd">当前求和为奇数再加</button>
        <button @click="incrementWait">等一等再加</button>
    </div>
</template>

<script>
export default {
    name: "Count",
    data() {
        return {
            sum:0,
            n:1
        }
    },
    methods: {
        decrement() {
            this.sum-=this.n
        },
        increment() {
            this.sum+=this.n
        },
        incrementOdd() {
            if(this.sum % 2){
                this.sum+=this.n
            }
        },
        incrementWait() {
            setTimeout(() => {
                this.sum+=this.n
            }, 300);
        },
    },
};
</script>

<style>
</style>